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Workflow API fuzzing harness for FastAPI endpoints.
This module uses Atheris to fuzz workflow create, update, trigger, and schedule
endpoints to discover crashes, security vulnerabilities, and edge cases.
Coverage:
- POST /api/workflows - Create workflow
- PUT /api/workflows/{id} - Update workflow
- POST /api/workflows/{id}/trigger - Trigger workflow execution
- POST /api/workflows/{id}/schedule - Schedule workflow
"""
import os
import sys
from typing import Dict, Any
import os
import sys
# Add backend to path
backend_dir = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
if backend_dir not in sys.path:
sys.path.insert(0, backend_dir)
import pytest
from fastapi.testclient import TestClient
from sqlalchemy.orm import Session
# Import fixtures
from tests.fuzzing.conftest import ATHERIS_AVAILABLE
from tests.e2e_ui.fixtures.database_fixtures import db_session
from tests.e2e_ui.fixtures.auth_fixtures import authenticated_user, test_user
from main_api_app import app
from core.database import get_db
# Try to import Atheris
try:
import atheris
from atheris import fp
ATHERIS_AVAILABLE = True
except ImportError:
ATHERIS_AVAILABLE = False
# ============================================================================
# TEST WORKFLOW CREATE FUZZING
# ============================================================================
@pytest.mark.fuzzing
@pytest.mark.slow
@pytest.mark.timeout(300)
def test_workflow_create_fuzzing(db_session: Session, authenticated_user):
"""
Fuzz workflow creation endpoint (POST /api/workflows).
PROPERTY: Workflow create endpoint should not crash on malformed input
STRATEGY: Use FuzzedDataProvider to generate random workflow definitions
INVARIANT: Response status code always in [200, 400, 401, 422] (no 500 errors)
RADII: 10000 iterations provides coverage of:
- SQL injection in workflow_name
- Empty/None values for required fields
- Malformed workflow_definition (nested, cyclical, huge)
- Invalid trigger configurations
Args:
db_session: Database session with transaction rollback
authenticated_user: (user, token) tuple for JWT auth
"""
if not ATHERIS_AVAILABLE:
pytest.skip("Atheris not installed")
user, token = authenticated_user
# Override database dependency
app.dependency_overrides[get_db] = lambda: db_session
# Create TestClient
client = TestClient(app)
# Set auth headers
headers = {"Authorization": f"Bearer {token}"}
def fuzz_one_input(data: bytes):
"""Fuzz workflow create endpoint with random input."""
try:
# Use FuzzedDataProvider for structured input
fdp = fp.FuzzedDataProvider(data)
# Fuzz workflow_name (0-100 chars, None, empty, SQL injection)
workflow_name = fdp.ConsumeRandomLengthString(100)
# Fuzz workflow_description (0-1000 chars, None, empty)
workflow_description = fdp.ConsumeRandomLengthString(1000)
# Fuzz workflow_definition dict (0-20 keys, nested structures)
num_keys = fdp.ConsumeIntInRange(0, 20)
workflow_definition = {}
for i in range(num_keys):
key = fdp.ConsumeRandomLengthString(50)
value_type = fdp.ConsumeIntInRange(0, 3)
if value_type == 0:
value = fdp.ConsumeRandomLengthString(100)
elif value_type == 1:
value = fdp.ConsumeIntInRange(-1000000, 1000000)
elif value_type == 2:
# Nested dict
nested_keys = fdp.ConsumeIntInRange(0, 5)
value = {fdp.ConsumeRandomLengthString(20): fdp.ConsumeRandomLengthString(50) for _ in range(nested_keys)}
else:
value = None
workflow_definition[key] = value
# Fuzz triggers list (0-10 items)
num_triggers = fdp.ConsumeIntInRange(0, 10)
triggers = []
for i in range(num_triggers):
trigger = {
"type": fdp.ConsumeRandomLengthString(20),
"config": {
"cron": fdp.ConsumeRandomLengthString(50),
"enabled": fdp.ConsumeBool()
}
}
triggers.append(trigger)
# Prepare request payload
payload = {
"name": workflow_name if workflow_name else None,
"description": workflow_description if workflow_description else None,
"definition": workflow_definition,
"triggers": triggers
}
# Call POST /api/workflows
response = client.post("/api/workflows", json=payload, headers=headers)
# Assert status in [200, 400, 401, 422] (no 500 errors)
assert response.status_code in [200, 400, 401, 422], \
f"Unexpected status {response.status_code}: {response.text[:200]}"
except Exception as e:
# Only re-raise if it's a crash (not validation error)
if "validation" not in str(e).lower() and "422" not in str(e):
raise
# Run fuzzing with Atheris
atheris.Setup(sys.argv, [fuzz_one_input])
atheris.Fuzz()
# ============================================================================
# TEST WORKFLOW UPDATE FUZZING
# ============================================================================
@pytest.mark.fuzzing
@pytest.mark.slow
@pytest.mark.timeout(300)
def test_workflow_update_fuzzing(db_session: Session, authenticated_user):
"""
Fuzz workflow update endpoint (PUT /api/workflows/{id}).
PROPERTY: Workflow update endpoint should not crash on malformed input
STRATEGY: Use FuzzedDataProvider to generate random workflow IDs and update data
INVARIANT: Response status code always in [200, 400, 404, 422] (no 500 errors)
RADII: 10000 iterations provides coverage of:
- Invalid workflow_id formats (None, empty, huge strings)
- Partial updates with null values
- Malformed workflow_definition
- SQL injection in update fields
Args:
db_session: Database session with transaction rollback
authenticated_user: (user, token) tuple for JWT auth
"""
if not ATHERIS_AVAILABLE:
pytest.skip("Atheris not installed")
user, token = authenticated_user
app.dependency_overrides[get_db] = lambda: db_session
client = TestClient(app)
headers = {"Authorization": f"Bearer {token}"}
def fuzz_one_input(data: bytes):
"""Fuzz workflow update endpoint with random input."""
try:
fdp = fp.FuzzedDataProvider(data)
# Fuzz workflow_id (50 chars, None, empty)
workflow_id = fdp.ConsumeRandomLengthString(50)
# Fuzz update_data dict (partial updates, null values, huge strings)
num_keys = fdp.ConsumeIntInRange(0, 10)
update_data = {}
for i in range(num_keys):
key = fdp.ConsumeRandomLengthString(50)
value_type = fdp.ConsumeIntInRange(0, 4)
if value_type == 0:
value = fdp.ConsumeRandomLengthString(1000)
elif value_type == 1:
value = None
elif value_type == 2:
value = fdp.ConsumeBool()
elif value_type == 3:
# Nested dict
nested_keys = fdp.ConsumeIntInRange(0, 5)
value = {fdp.ConsumeRandomLengthString(20): fdp.ConsumeRandomLengthString(100) for _ in range(nested_keys)}
else:
value = fdp.ConsumeIntInRange(-1000000, 1000000)
update_data[key] = value
# Call PUT /api/workflows/{id}
response = client.put(f"/api/workflows/{workflow_id}", json=update_data, headers=headers)
# Assert status in [200, 400, 404, 422]
assert response.status_code in [200, 400, 404, 422], \
f"Unexpected status {response.status_code}: {response.text[:200]}"
except Exception as e:
if "validation" not in str(e).lower() and "422" not in str(e):
raise
atheris.Setup(sys.argv, [fuzz_one_input])
atheris.Fuzz()
# ============================================================================
# TEST WORKFLOW TRIGGER FUZZING
# ============================================================================
@pytest.mark.fuzzing
@pytest.mark.slow
@pytest.mark.timeout(300)
def test_workflow_trigger_fuzzing(db_session: Session, authenticated_user):
"""
Fuzz workflow trigger endpoint (POST /api/workflows/{id}/trigger).
PROPERTY: Workflow trigger endpoint should not crash on malformed input
STRATEGY: Use FuzzedDataProvider to generate random workflow IDs and input data
INVARIANT: Response status code always in [200, 400, 404, 422] (no 500 errors)
RADII: 10000 iterations provides coverage of:
- Invalid workflow_id formats
- Huge input_data payloads (DoS protection)
- Nested structures with cyclical references
- SQL injection in input fields
Args:
db_session: Database session with transaction rollback
authenticated_user: (user, token) tuple for JWT auth
"""
if not ATHERIS_AVAILABLE:
pytest.skip("Atheris not installed")
user, token = authenticated_user
app.dependency_overrides[get_db] = lambda: db_session
client = TestClient(app)
headers = {"Authorization": f"Bearer {token}"}
def fuzz_one_input(data: bytes):
"""Fuzz workflow trigger endpoint with random input."""
try:
fdp = fp.FuzzedDataProvider(data)
# Fuzz workflow_id (50 chars, None, empty)
workflow_id = fdp.ConsumeRandomLengthString(50)
# Fuzz input_data dict (0-20 keys, nested values, huge payloads)
num_keys = fdp.ConsumeIntInRange(0, 20)
input_data = {}
for i in range(num_keys):
key = fdp.ConsumeRandomLengthString(50)
value_type = fdp.ConsumeIntInRange(0, 3)
if value_type == 0:
# Huge string (DoS test)
value = fdp.ConsumeRandomLengthString(10000)
elif value_type == 1:
# Nested dict (cyclical ref test)
nested_keys = fdp.ConsumeIntInRange(0, 10)
value = {fdp.ConsumeRandomLengthString(30): fdp.ConsumeRandomLengthString(100) for _ in range(nested_keys)}
elif value_type == 2:
value = fdp.ConsumeIntInRange(-1000000, 1000000)
else:
value = None
input_data[key] = value
payload = {"input_data": input_data}
# Call POST /api/workflows/{id}/trigger
response = client.post(f"/api/workflows/{workflow_id}/trigger", json=payload, headers=headers)
# Assert status in [200, 400, 404, 422]
assert response.status_code in [200, 400, 404, 422], \
f"Unexpected status {response.status_code}: {response.text[:200]}"
except Exception as e:
if "validation" not in str(e).lower() and "422" not in str(e):
raise
atheris.Setup(sys.argv, [fuzz_one_input])
atheris.Fuzz()
# ============================================================================
# TEST WORKFLOW SCHEDULE FUZZING
# ============================================================================
@pytest.mark.fuzzing
@pytest.mark.slow
@pytest.mark.timeout(300)
def test_workflow_schedule_fuzzing(db_session: Session, authenticated_user):
"""
Fuzz workflow schedule endpoint (POST /api/workflows/{id}/schedule).
PROPERTY: Workflow schedule endpoint should not crash on malformed cron expressions
STRATEGY: Use FuzzedDataProvider to generate random schedule configurations
INVARIANT: Response status code always in [200, 400, 404, 422] (no 500 errors)
RADII: 10000 iterations provides coverage of:
- Invalid cron expressions (syntax errors, out-of-range values)
- Special characters in cron fields
- Past dates in schedule config
- Huge intervals (DoS protection)
Args:
db_session: Database session with transaction rollback
authenticated_user: (user, token) tuple for JWT auth
"""
if not ATHERIS_AVAILABLE:
pytest.skip("Atheris not installed")
user, token = authenticated_user
app.dependency_overrides[get_db] = lambda: db_session
client = TestClient(app)
headers = {"Authorization": f"Bearer {token}"}
def fuzz_one_input(data: bytes):
"""Fuzz workflow schedule endpoint with random input."""
try:
fdp = fp.FuzzedDataProvider(data)
# Fuzz workflow_id (50 chars, None, empty)
workflow_id = fdp.ConsumeRandomLengthString(50)
# Fuzz schedule_config dict (cron expressions, intervals, invalid formats)
schedule_type = fdp.ConsumeRandomLengthString(20)
schedule_config = {
"type": schedule_type,
"cron": fdp.ConsumeRandomLengthString(100), # Invalid cron syntax
"interval_seconds": fdp.ConsumeIntInRange(-1000000, 1000000), # Invalid interval
"start_date": fdp.ConsumeRandomLengthString(50), # Invalid date format
"enabled": fdp.ConsumeBool()
}
# Call POST /api/workflows/{id}/schedule
response = client.post(f"/api/workflows/{workflow_id}/schedule", json=schedule_config, headers=headers)
# Assert status in [200, 400, 404, 422]
assert response.status_code in [200, 400, 404, 422], \
f"Unexpected status {response.status_code}: {response.text[:200]}"
except Exception as e:
if "validation" not in str(e).lower() and "422" not in str(e):
raise
atheris.Setup(sys.argv, [fuzz_one_input])
atheris.Fuzz()
# ============================================================================
# TEST WORKFLOW DAG VALIDATION FUZZING
# ============================================================================
@pytest.mark.fuzzing
@pytest.mark.slow
@pytest.mark.timeout(300)
def test_workflow_dag_validation_fuzz(db_session: Session, authenticated_user):
"""
Fuzz workflow DAG validation (cyclical dependencies, missing nodes).
PROPERTY: Workflow DAG validation should not crash on malformed graphs
STRATEGY: Use FuzzedDataProvider to generate random node/edge configurations
INVARIANT: Response status code always in [200, 400, 422] (no 500 errors)
RADII: 10000 iterations provides coverage of:
- Cyclical node dependencies (a -> b -> a)
- Missing node references (edge points to non-existent node)
- Empty or None node lists
- Self-referencing nodes
Args:
db_session: Database session with transaction rollback
authenticated_user: (user, token) tuple for JWT auth
"""
if not ATHERIS_AVAILABLE:
pytest.skip("Atheris not installed")
user, token = authenticated_user
app.dependency_overrides[get_db] = lambda: db_session
client = TestClient(app)
headers = {"Authorization": f"Bearer {token}"}
def fuzz_one_input(data: bytes):
"""Fuzz workflow DAG validation with random input."""
try:
fdp = fp.FuzzedDataProvider(data)
# Fuzz nodes list (0-20 nodes)
num_nodes = fdp.ConsumeIntInRange(0, 20)
nodes = []
node_ids = []
for i in range(num_nodes):
node_id = fdp.ConsumeRandomLengthString(30)
node_ids.append(node_id)
nodes.append({
"id": node_id,
"type": fdp.ConsumeRandomLengthString(20),
"config": fdp.ConsumeRandomLengthString(100)
})
# Fuzz edges list (0-30 edges, potentially cyclical)
num_edges = fdp.ConsumeIntInRange(0, 30)
edges = []
for i in range(num_edges):
# Use random node IDs or generate invalid ones
from_idx = fdp.ConsumeIntInRange(0, len(node_ids) + 5)
to_idx = fdp.ConsumeIntInRange(0, len(node_ids) + 5)
from_node = node_ids[from_idx] if from_idx < len(node_ids) else fdp.ConsumeRandomLengthString(30)
to_node = node_ids[to_idx] if to_idx < len(node_ids) else fdp.ConsumeRandomLengthString(30)
edges.append({
"from": from_node,
"to": to_node,
"condition": fdp.ConsumeRandomLengthString(50)
})
# Create workflow with DAG definition
payload = {
"name": fdp.ConsumeRandomLengthString(50),
"definition": {
"nodes": nodes,
"edges": edges
}
}
# Call POST /api/workflows (will trigger DAG validation)
response = client.post("/api/workflows", json=payload, headers=headers)
# Assert status in [200, 400, 422]
assert response.status_code in [200, 400, 422], \
f"Unexpected status {response.status_code}: {response.text[:200]}"
except Exception as e:
if "validation" not in str(e).lower() and "422" not in str(e):
raise
atheris.Setup(sys.argv, [fuzz_one_input])
atheris.Fuzz()
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